Check engine light diagnosis: why the code is only the starting point
How scan data, circuit testing and symptom verification prevent parts-cannon diagnosis.
Read diagnostic guideWorkshop knowledge • practical diagnosis
Mechanic technical articles & diagnostic guides
Straightforward automotive information built around testing first, confirming the fault and replacing parts only when the evidence supports it.
20+years of hands-on experienceFactory-trained diagnostic and repair knowledge, explained for Australian vehicle owners and technicians.
Technical library
Understand the test, not just the fault code
A diagnostic trouble code identifies the system that detected a problem. It does not automatically identify the failed component.
These articles explain the checks used to separate wiring, control, mechanical and component faults. Vehicle-specific specifications must still be confirmed against current manufacturer service information.
Battery drain diagnostics without disturbing module sleep
A logical path for verifying battery condition, charging performance and parasitic current.
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Electrical fault diagnosis: voltage-drop testing under load
Why continuity alone can miss resistance and how loaded circuit tests expose real wiring faults.
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Alternator testing beyond a battery-voltage reading
Charging command, cable voltage drop, load response and ripple checks explained.
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No-start diagnosis: separating no-crank from crank-no-start
The first split in an efficient no-start workflow and the measurements that follow.
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Brake noise diagnosis: squeal, grind, click or shudder
Using when, where and how the noise occurs to direct a safe physical inspection.
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When brake rotors require replacement
Thickness, scoring, heat damage and lateral runout considerations before quoting parts.
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Cooling-system leak and overheating diagnosis
Pressure testing, temperature comparison and fan-control checks before component replacement.
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Timing-belt replacement planning and related components
Why service history, interval, tensioners, idlers and water-pump condition all matter.
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What a proper logbook service should include
Scheduled items, correct fluids, inspection findings and service-record requirements explained.
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Diagnosing loss of power and underboost faults
Commanded versus actual data, intake integrity and actuator checks before condemning a turbo.
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What a pre-purchase inspection can—and cannot—prove
How scan checks, road testing and physical inspection reduce risk without promising the future.
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How to use these guides
General information, backed by vehicle-specific data
Testing methods are broadly applicable, but pin assignments, expected voltages, torque values, fluid specifications and service procedures vary by model, engine, build date and market. Confirm exact data using manufacturer or licensed service information before repair work.
Safety-critical work involving braking systems, vehicle support, fuel, refrigerant, high voltage or supplemental restraint systems requires suitable training, equipment and controls.
Written from the workshop
Mobile Motive combines more than 20 years of trade experience with current scan tools, oscilloscope testing and licensed service information.
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ARCtick Licence AU068264
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